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Earth-Resistivity near the Kakioka Magnetic Observatory(I)
From April 1948 the earth-resistivity has been measured by the Wenner-Gish-Rooney method at the Kakioka Magnetic Observatory, by using several systems of electrode arrangement and base length. In the present paper the outline of the field equipments, method and apparatus and corresponding some preliminary experiments were described.
It was shown that both the alternated direct current method and low frequency ratiometer method afforded the same result within the error 3 - 5%. Some discussions were made about the lateral and vertical distribution of the earth-resistivity and its connection with the amplitudes of the earth-current potential gradient measured at several points.
We could find no diurnal variation of the resistivity from any base used. Monthly mean values of each base were tabulated for the aid of some understanding the fluctuation in the course of longer period.
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